Extensible windshield wiper arm



April 5, 1949. 1. NEs'soN 2,466,609

EXTENSIBLE WINDSHIELD WIPER ARM Original Filed Dec. 10, 1943 To N lNvENToR- ISRAEL NEssoN WW ATTORN EYS Patented Apr. 5, 1949 PAT. oFFici-r 2;466,609 EXTENSIBEEWINDSHIELD WIPER ARM' IsraelNesson-Lynn, Massi, assigner to: Max: Zaigen, Swampscott;Mass; Originalapplication December 10, 1943,.Serial".o.

Divided and this application March 4fclaims. i

This. invention relates. toty windshield.I wiper armsr andi pertains morel particularly to: articulated.` telescoping arms of the; type disclosed in Zai'ger:- Patents` Nosl. 252.452.441 252953620 and 25312.2578;l

This applioatiom is. ai divisioni. of:` my cepending: applicationserial No: 513,697, led' December 11943/ and: allowed' Au`gu'st25?,.194'6,l forxWindr shield'` Wiper arm; ,nowBat'ent No. ,2341.7 ',99-1; dated March' 253 1947;

Thel principal: purpose of the? presenty invention is; to;` improve the` construction arrangement of; the; telescoping; extension, bars.. the flat spring members; whichI retain. the; extension.` barsl in adi- ;iustedrelation., and the tension; springf winch norm-allyy urges.y the1 articulated', arm tof'swing at anang-le With-respectto the coupling.: member and toward? thee windshield with: the desireddeigree of adfiustablepre'ssura I Thev above object,1 andf other objects willf-bfe made f morel apparent. hereinafter, isf obtained: by means subsequentlyI to be describedand shown n.- the accompanying; drawing;l in.- which:

Fig. 11 is a plan view-'oftheimprovedfwiperarmi;

Fig. 2 is a longitudinal section thereof;

Fig; 3fis*` a; bottom view of the arm of Figs. l and 2;

Fig. 4 is an enlarged section taken on the line 4-4 of. Fig. 2;.

Fig. 5 is a fragmentary longitudinal` section through the coupling and arm body illustrating a modied form of. tension spring.

Inv the particular embodiment chosen` for the purpose of illustrating the novelty of this invention, the` improved wiper armcomprisesai coupling member indicated generally at I0, a channeled arm body I2 hinged to the coupling member at the pivot I 4, an intermediate channeled extension bar I6 slidable within the channeled body I2, a ilat secondary extension bar I8 slidable within the channeled bar I 6, and an end piece or terminal 20 disposed lat the outer end of the bar -I6 and adapted for attachment to a windshield wiper blade.

The telescoping action of the extension bars I6 and I 8 is restrained by leaf springs which hold these bars in the adjusted positions to which they may readily be moved by hand. The intermediate extension bar I6 is box-shaped in cross section throughout its length, the bottom margins 22 of the channeled metal body being turned in against each other. The arm body I2 also has a box-shaped portion formed by the inturned bottom margins 24.

An intermediate extension bar spring 26 fits betweenf the'bottomawall 22; of; thevbary |176 and the bottom wallszll, of body Ig2,` and hasan end tab. 28 and; a shoulder- 30"- engagingY opposite ends of. saidI bottom? wall 2li;l thereby to;l restrain relative: longitudinali, movement of; the body, I2 and spring 2li.V whichbears against the intermediate extensionbar and restrainsuits -slidingmovement Somewhat similarly;-` an extension; bar spring Mints-between theunder side ofi the bar I8:and the bottom wall= 221 oi the; bar I6, and.- has. end tabs 34 and 36 engaging the opposite ends of the bottom-wall 2 2; to holdthe springg in operative position-toibear-against thebar` IB and restrain its:y sliding.` movement. Thev downwardly pro,- jectingy tabs v 34 and 36g also `servezas stops tolimlt longitudinal. movement of the bal.`- llik by en gaging; the -springf end 28- a'nd, spring shoulder 3D respectively. Outward: movement of bar I8- is limited. by the engagement ofv a stud stop- 38. of the4 bar with. a. shoulder llIl.A formed at the inner endfof a-.bowedi portion ofA` spring-32 asindicated inh Fig. 2. y

The pivoted,V telescoping. arm is pressed. to-

ward the; windshield onv whichV itis mounted and normally urged. to swing. atan, angle with respect lio/coupling Iil;.as shown. in Figs. 1 to 3, byfa tenvsion spring 4.2. here shownv as composed of two superposedy leavesboth, secured to the inner porftion ofV spring Zlby. arivet 44 or other fastening. InWar-dly bentftabsfof ther arm body I2I vafford a ul'crum for the tension springv members., and the rearward end of. tension spring 42 engages a roller 4'8` carried by a rocker lever having. sides which receive and swingT on the, arm pivot I`4, in the form shownin Eig. 2'.

They-action' oithetension spring tendsto swing the arm inwardly, toward the windshield; with respect to the coupling IIJ, and the degree of tension may be varied by providing an adjusting screw 52 which threads in a trunnion nut 54 carried by the rocker lever 50, and thus regulates the position of the lever and of its roller 48 relative to the coupling l0.

An optional form of tension spring is illustrated in Fig. 5 which shows a coiled spring 56 connected at one end to the rear end of a shortened intermediate extension bar spring 26', and connected at its other end to a modified form of rocker lever 58. In this case, the lever sides have notches removably receiving the pivot pin I4, so that the rocker and spring may be applied after the arm body I2 is hinged to the coupling member I0. The position of the lever 58 may be regulated to adjust the tension of the coiled spring 56 by the screw and nut arrangement just described.

It will be realized that the coupling l which is shown attached to the oscillating motor shaft 56 may assume an entirely different form than that illustrated, since the coupling forms no part of the present invention. Structural variations of the arm itself, one embodiment of which has been described and illustrated in detail, are also possible within the scope and spirit of the appended claims.

I claim:

1. In a windshield Wiper arm, a channeled arm body having inturned ilanges forming a. bottom wall portion thereof, a channeled intermediate extension bar slidable within said arm body and having inturned flanges forming a bottom wall, a flat extension bar slidable within the intermediate extension bar, a spring disposed between the bottom wall portion of the arm body and the bottom wall of the intermediate extension bar, and a spring disposed between the bottom wall of the intermediate extension bar and the at extension bar, said springs being operative to hold the extension bars in adjusted position, the first named spring having flange and shoulder portions engaging opposite ends of the bottom Wall portion of said arm body to prevent relative longitudinal displacement therebetween, and the second named spring having end flanges engaging opposite ends of the bottom wall of the intermediate extension bar to prevent relative longitudinal displacement therebetween.

2. In a Windshield wiper arm, a channeled arm body having inturned anges forming a bottom wall portion thereof, a channeled intermediate extension bar slidable within said arm body and having inturned flanges forming a bottom Wall, a flat extension bar slidable within the intermediate extension bar, a spring disposed between the bottomwall portion of the arm body and the bottom wall of the intermediate extension bar, and a spring disposed between the bottom wall of the intermediate extension bar and the at extension bar, said springs being operative to hold the extension bars in adjusted positive to hold the extension bars in adjusted position, the rst named spring having ilange and shoulder portions engaging opposite ends of the bottom wall portion of said arm body to prevent relative longitudinal displacement therebetween, and the second named spring having end flanges engaging opposite ends of the intermediate extension bar to prevent relative longitudinal displacement therebetween, said end flanges forming stops engageable with the flange and shoulder of the first named spring to limit longitudinal movement of the intermediate extension bar, the second named spring having a shoulder and the flat extension bar having a detent forming a stop engageable with said shoulder to limit outward movement of said flat extension bar.

3. In a windshield wiper arm, a channeled arm body having inturned iianges forming a bottom wall portion thereof, a channeled intermediate extension bar slidable within said arm body and having inturned flanges forming a bottom wall, a ilat extension bar slidable within the intermediate extension bar, a spring disposed between the bottom wall portion of the arm body and the bottom wall of the intermediate extension bar, and a spring disposed between the bottom wall of the intermediate extension bar and the flat extension bar, said springs being operative to hold the extension bars in adjusted position and having means preventing their longitudinal displacement relative to the arm body and extension bar in which they are disposed, a shaft coupling member pivoted to said arm body and having a transverse abutment at its inner end, and a tension spring attached to said first named spring and engaging the abutment of said coupling member, so that the arm body is urged to angular position withrespect to the coupling member.

4. In a windshield Wiper arm, a channeled arm body having inturned flanges forming a bottom wall portion, an extension bar slidable within said arm body, a spring disposed between said bottom portion and said bar, said spring serving to hold the extension bar in adjusted position and having means preventing its longitudinal displacement relative to said bottom wall, a coupling for connecting the arm body to a shaft, a pin pivotally connecting the arm body to the coupling, a rocker lever pivoted on said pin and having a roller at` one end, a tension spring aflixed to said iirst named spring and engaging said roller, so that the arm body is urged to angular position with respect to the coupling and means connected to the opposite end of said rocker lever for adjusting the position of said roller with respect to said second named spring and the end of the arm body.

ISRAEL NESSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,215,371 Horton Sept. 17, 1940 2,295,621 Zaiger Sept. l5, 1942 

